cgroup: clean up printk()

Convert the only printk() to use pr_*() helper. No functional change.

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Author: kamalesh-babulal

kernel/cgroup/cgroup.c

@@ -6086,8 +6086,8 @@ int __init cgroup_init(void)
 			continue;
 
 		if (cgroup1_ssid_disabled(ssid))
-			printk(KERN_INFO "Disabling %s control group subsystem in v1 mounts\n",
-			       ss->name);
+			pr_info("Disabling %s control group subsystem in v1 mounts\n",
+				ss->name);
 
 		cgrp_dfl_root.subsys_mask |= 1 << ss->id;